function getInternetExplorerVersion() { var rv = -1; // Return value assumes failure. if (navigator.appName == 'Microsoft Internet Explorer') { var ua = navigator.userAgent; var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})"); if (re.exec(ua) != null) rv = parseFloat(RegExp.$1); } return rv; } function checkVersion(ver_req) { var msg = "You're not using Windows Internet Explorer."; var returnvalue = false; var ver = getInternetExplorerVersion(); if (ver > -1) { if (ver <= ver_req) return true; else return false; } return msg; } if checkVersion(8.0) { window.onload = function(){addCorners("rnd");} /* Change "rnd" to the name of your class */ }